This is a real tough WIP for me since I did the portrait on a dark Canson paper (11×14), using charcoal and white chalks. Unfortunately, this is the only decent reference photo of this famous surgeon. The photo is not that great and also appears to be has two light sources, but the one on his left side is the strongest one, I assume. Since I used the iPhone as a camera the result of the final photo appears to have a lot of contrast, but I think that is not the case.
The Gray scale(value) of the paper is around 3 and 4. I did not apply the full force of the white chalk on the lab coat for obvious reasons.
I felt that the reference photo has a very limited number of values, so I was trying to come up with more middle tones otherwise there will be too much contrast, I think.
What do you think?